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Problem solved.
The 3 new serial to usb adapters arrived today.
2 were recognised as prolific and the third as Ser.
All drivers were successfully installed and robofocus worked perfectly fine on all of,them.
It seems that prolific no longer support their old chip with Windows 10.
And all 3 previous cables I had had the old version of their chip.
Thank you both Charles and Glen for your input.
John.
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